* {
    margin: 0;
}

:root {
    font-size: calc(.5vw + .5vh + 4px);
    /* font-size: 100%; */
    font-family: "Microsoft YaHei";
    box-sizing: border-box;
}

body {
    margin-left: 5.7%;
    margin-right: 5.7%;
}

span {
    display: inline-block;
    margin-left: 0.6rem;
    margin-right: 1rem;
}

.bit-header {
    margin-top: 5vw;
    width: 100%;
    font-size: 1.25rem;
}

.bit-header-nav-ul {
    display: flex;
    position: relative;
    list-style: none;
    padding-left: 0;
}

@media only screen and (max-width: 500px) {
    .bit-header-nav-ul {
        display: flex;
        align-items: center;
        justify-content: space-around;
    }
}

.bit-nav {
    align-self: center;
    min-width: 6.6rem;
    min-height: 1.68rem;
    font-size: 1.25rem;
    letter-spacing: 0.38rem;
}

.bit-header-nav-ul-li {
    position: relative;
    display: flex;
    align-items: center;
    flex-direction: row-reverse;
}

.right {
    position: relative;
    display: flex;
    align-items: center;
    flex-direction: column;
}

@media only screen and (max-width: 500px) {
    .bit-header-nav-ul-li {
        margin-left: 2rem;
    }
}

.bit-first {
    display: inline-block;
    height: 9vw;
    width: 6vw;
}

.flex {
    position: relative;
    display: flex;
    align-items: center;
    height: 3.5rem;
    z-index: 100;
}

@media only screen and (max-width: 1024px) {
    .flex {
        height: 2.6rem;
    }
}

.flex span {
    letter-spacing: 0.69rem;
    font-size: 1.38rem;
}

@media only screen and (max-width: 1024px) {
    .flex span {
        letter-spacing: .36rem;
        margin: 0 .2rem;
    }
}

@media only screen and (max-width: 700px) {
    .flex span {
        letter-spacing: .1rem;
        margin: 0 .1rem;
    }
}

.bit-header-nav-ul li a {
    text-decoration: none;
}

.bit-header-nav-ul-li-second {
    position: absolute;
    padding-left: 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    width: 16vw;
    min-width: 8.4rem;
    min-height: 9.7rem;
    letter-spacing: 0.69rem;
    list-style: none;
    display: none;
    background-color: #ffffff;
    z-index: 80;
    list-style-type: decimal-leading-zero;
}

.bit-header-nav-ul-li-second li {
    display: inline-block;
    height: 2.6rem;
    list-style-type: decimal-leading-zero;
}

.bit-header-nav-ul-li-second li a {
    margin-left: -2rem;
    display: inline-block;
    line-height: 2.4rem;
    font-size: 1.16rem;
    font-weight: 500;
    letter-spacing: 0.3rem;
}

@media only screen and (max-width: 1024px) {
    .bit-header-nav-ul-li-second li a {
        margin-left: -0.1rem;
    }
}

.bit-length-first {
    margin-left: 2.7%;
}

@media only screen and (max-width: 500px) {
    .bit-length-first {
        margin-left: 1%;
    }
}

.bit-length-second {
    margin-left: 2.1%;
}

@media only screen and (max-width: 500px) {
    .bit-length-second {
        margin-left: 1%;
    }
}

.bit-length-third {
    align-self: center;
    flex-grow: 1;
}

@media only screen and (max-width: 500px) {
    .bit-length-third {
        margin-left: 6%;
    }
}

.bit-nav:hover {
    font-weight: 700;
}

.color {
    color: #b3b3b3;
}

.color-white {
    background-color: #ffffff;
}

.color-white-special {
    background-color: #ffffff;
    border-radius: 0 0 .7rem .7rem;
    -ms-border-radius: 0 0 .7rem .7rem;
}

.color-white a {
    color: #000000;
}

.color-white-special a {
    -ms-border-radius: 0 0 .7rem .7rem;
    border-radius: 0 0 .7rem .7rem;
    color: #000000;
}

.color-white:hover {
    background-color: #d8d8d881;
}

.color-white-special:hover {
    -ms-border-radius: 0 0 .7rem .7rem;
    border-radius: 0 0 .7rem .7rem;
    background-color: #d8d8d881;
}

.special-height {
    height: 3.5rem !important;
}

@media only screen and (max-width: 1024px) {
    .special-height {
        height: 2.6rem !important;
    }
}

